Nothing will install on my tablet

When i install apps from Google play, it tells me, Congratulations, the app will be soon installed to your device. But nothing happens. I try it more times but still nothing.
When i download an app (even installer) and want to install it over Total Commander, i click install and then it starts testing on viruses, since then nothing happens. It only runs testing for 1/2 hr or more. Please help.

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